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[Objective] To research the inhibitory effects of polysaccharides from Dendrobium officinale and Dendrobium hookerianum on Staphyloccocus aureus, Escherichia coli and Bacillus subtilis in vitro.[Method] The antibacterial activity of two Dendrobium polysaccharides on the above bacteria were explored by filter paper disk method.[Results] Polysaccharide from Dendrobium officinale showed the most remarkable antibacterial effect on Escherichia coli, i.e., the minimal inhibitory concentration(MIC) was 0.5%, and the diameter of inhibition zone was 15.8 mm; polysaccharide from Dendrobium hookerianum showed the most remarkable antibacterial effect on Bacillus subtilis, i.e., MIC was 0.5%, and the diameter of inhibition zone was 12.8 mm. [Conclusion] Polysaccharide from Dendrobium officinale had antibacterial effect on Escherichia coli and Bacillus subtilis, while that from Dendrobium hookerianum showed antibacterial effect on all tested bacteria.
[Objective] To research the inhibitory effects of polysaccharides from Dendrobium officinale and Dendrobium hookerianum on Staphyloccocus aureus, Escherichia coli and Bacillus subtilis in vitro. [Method] The antibacterial activity of two Dendrobium polysaccharides on the above bacteria were explored by filter paper disk method. [Results] Polysaccharide from Dendrobium officinale showed the most remarkable antibacterial effect on Escherichia coli, ie, the minimal inhibitory concentration (MIC) was 0.5%, and the diameter of inhibition zone was 15.8 mm; polysaccharide from Dendrobium officinale showed the most remarkable antibacterial effect on Bacillus subtilis, ie, MIC was 0.5%, and the diameter of inhibition zone was 12.8 mm. [Conclusion] Polysaccharide from Dendrobium officinale had antibacterial effect on Escherichia coli and Bacillus subtilis, while that from Dendrobium hookerianum showed antibacterial effect on all tested bacteria .